Locomotive draft appliance



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n, M. LEwls' LOCOMOTIVE DRAT APPLIANCE Filed Aug. 18, 19251 :2VSheets-Sheet 2 Wyk-SM @Mou/L Patentes May 2e, 1925. o

DAVID M. LEWIS., OE`

Y e f insana snif; yorricse.jN

oriIoAeo, 1LL1No1s, Assrenon To 11E-wis'. Duarte Armi-ANGE COMPANY, `.aconroimrron or rtnilaois.` v

nocoiyrocrivn DRAFT APPLIANGE.

Application filed August 18, 1921. 'Serial No.` 493,312.

To aZZ whom t may concern:` t

` Be it known that I, DAVID M. Lnwrs, acitizen of the United States,residing at Chicago, in the county of Cook and State of Illinois,ha`veinvented certain new and use` which affords minimum obstruction to thc`smoke box and in which accessgmay-behad to the interior of the smokebox.

The invention further relates to features of construction andcombination of parts to be more fully hereinafter set forth.

The foregoing, together with such other objects as may hereinafterappear, I obry tain by means of a construction which I have illustratedin preferred form in the accompanying drawings wherein:

Ilig. .1 is a longitudinal section through a Y.

locomotive smoke .box embodying my improvements; and-Fig. 2 is vatransverse section through the smoke box of Figplon the lines 2--2. Y yv .Referring now to the drawings,the smoke box, which is cylindrical, isindicated at 7.; 8 is kthe line sheet having the usualfiues 49 andsuperheater flues 10; 11 are the superheater units and 12 the steampipes. `The upper portions of the saddle are shownat 13' and a portionof the exhaust passages therein at 14.

The reference `number 15 denotes a stack which is elongated in crosssection, with its major axis extending"longitudinally of the smoke box,such stack being provided with a similarly shaped petticoat 16, the endsand sides of which, however, ilarc at the bottom. Bolted to thebase 14kis a `nozzle stand 17, such stand being divided into two longitudinalchambers or passages 18 and 19 by means of the wall 20. The top of thenozzle stand 17 is in the form of a table 21, constituting a base for anozzle housing 22. This nozzle housinjis elongated in cross section withits magor axis longitudinal of the smokebox in a manner corresponding to`interval between cylinder exhaust.

the stack, and :mounted withinthe housing yare two vanes A23, mountedonshafts 24,

geared togetherin the manner indicated'in Fig;y 2, onel of said shaftsbeing provided withan arm connected by the link"26 with arm. 27 keyed tothe shaft 28. The `shaft 28 extends out through the side oft-he smokebox shell and fisprovided with an Aeo arm 29 connectedwith adash pot`pistonk rod 30,1which isweighted' as at 311 The ac-` tion ofk the weighttendsto hold the varies lclosed. The vanos when open create anoz- 4zleopeningl which is elongatedlongitudinally ofthe box. "Steam flows to thenozzle from `the passage 19, .theupper wall of which has an. opening19afor this purpose.y

The forward end of thechamber 18 comjmunicates with theinlet end 32 ofan expansion or volume chamber 33 which is of annular shape, theouterwall being formed bythe shell y of the smoke bon, thel inner wall bykthe member `34 and the `front and rear walls by the membersdand '36,re-y spectively. ,Thefoutlet end of the Avolume chamber communicateswith the chamber 19. The central lopening,through the vol- `ume chamberpermits of access to theflues` andflue sheet, and` also to the nozzleand nozzle standand it is covered over by the removable plate 37.` y yExhaust steam from the cylinders is lead to thebase cavitygll in theusual manner and from `suchcavity it flows to the chamber 18, then tothe inlet 32 of thevolume `chamber, iiowing around the volume Hchamberthrough the outlet 322" thereof Vinto"` the 'chamber V19, and `thencetothe nozzlel When the pressure in, the `volume chamber `builds up tothe value-at which itwill overcome lthe v `effect of` the weights 31,the `vanes `23v will open and a continuous -flow or blastof eX- hauststeam will take placek through the nozzle opening thus'created as longas the`looolmotive .is using steam. The" pulsations of the exhaustblast' from the k,cylinders are ironed out by the expansion takingplace.inl

the volume chamber, which is of such size (preferably at least severaltimes the capacity of the cylinders) as to permit the exhaust steam toexpand considerably, thereby insuring continuity of theblast during theThe exhaust steam is thus discharged from the nozzle in the form of athin, long column of relatively low pressure and low velocity.

' pressure to the desired value necessary to produce adequate draft. Thevanes, there fore, constitute an automatic governor 'mechanismresponsive to exhaust pressure conditions and operating to maintain theback pressure within the maximum necessary to produce adequate draft forthe particular locomotive and class of service.

The exhaust draft columnpresents a max imum entrainment area and thuscreates an effective draft. Notwithstanding the disposition o-f thenozzle lengthwise of the smoke box, the continuous draft blast operatesto draw effectively on all of the flues the side flues as well as thecenter fluesbecause the greatest entrainment areas are at the sides ofthe column and therefore a curvilinear sweep of the products ofcombustion from the side fines takes place and thus the side flues areworked substantially equally with the center flues, securing advantagesand obviating difculties well understood in this art. At the same timethe disposition of parts is suoli as to afford a minimum obstruction tothe smoke box, permitting ready access to fines and flue sheets andsuperheater units as well as to the nozzle proper and its associatedparts.

lVhat I claim is:

l. In a locomotive draft appliance, the combination Vof an elongatednozzle having its major axis longitudinal of the smoke box, a similarlyshaped and disposed stack, and

\ a volume chamber.

vits major axis longitudinal of the smoke box, a similarly shaped anddisposed stack, and a volume.' chamber in series with the nozzle.

3. In a locomotive draft appliance, the combination of an elongatednozzle having its major axisl longitudinal of the smoke box, a similarlyshaped and disposed stack. and the` volume chamber in series with thenozzle, said nozzle having automatic means for creating the nozzleopening responsive to pressure conditions obtaining on the haust side ofthe cylinders.

4. In a locomotive draft appliance, the

- combination with the saddle casting having an exhaust passage, of anozzle, a volume chamber, having an inlet and an outlet, and a nozzlestand having two passages, one connectingvsaid exhaust passage and saidinlet and the other connecting said outlet and the nozzle, the nozzlebeing elongated with its major axis longitudinal of the smoke box.

5. IIn a locomotive draft appliance, the combination of a smoke box, aflue sheet and its flues, an elongated nozzle the major axis yof whichisloiigitudinal of the smoke box, and an annular volume chamber in thefront of the smoke box connected with the nozzle affording access to theinterior through the central opening thereof. v

6. In a locomotive draft appliance, the combination of an elongatednozzle having its major axis longitudinal ,of the smoke box, and avolume chamber in series with the nozzle.

In a locomotive kdraft appliance, thel combinationof a smoke box, a iiuesheet with its flues, an elongated nozzle the maJor axis of which islongitudinal of the smoke box, and an annular volume chamber in serieswith said nozzle, access to the nozzle yits major axis longitudinal ofthe smoke box and a similarly shaped and disposed stack. In testimonywhereof,` I have 'hereunto signed my name. I

DAVID M. Lnvvis.v

